Keystones — Capstone
Five GCSE retrieval questions · 5 January 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² - 5x + 5
Answer: (x - 5⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 18cm, angle = 55°. Give your answer to 2 decimal places
Answer: 110.59cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 42:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 50, 24, 90, 77, 45, 88. Give your answer to 2 decimal places
Answer: Mean = 59.86, Median = 50, Range = 66